Question 1

Which one or more of the following is a vector quantity?

Accepted Answer

A)   Linear momentum.
B)   Angular momentum.
C)   Kinetic energy.
D)   Potential energy.
E)   Both A and B.F) B) and E)
G) D) and E)

Question 2

When the speed v of an object of mass m approaches the speed of light c, its kinetic energy

Accepted Answer

A)  is less than 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mv2.
B)  equals 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mv2.
C)  is more than 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mv2 but less than 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mc2.
D)  is more than 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mv2 and can exceed 2. 
B)  equals   mv2. 
C)  is more than   mv2 but less than   mc2. 
D)  is more than   mv2 and can exceed   mc2." class="answers-bank-image d-inline" rel="preload" > mc2.E) C) and D)
F) A) and B)

Question 3

A ball whose momentum is mv strikes a wall and bounces off.The change in the ball's momentum is

Accepted Answer

A)  0.
B)  0.5 mv
C)  mv
D)  2 mvE) C) and D)
F) A) and B)

Question 4

The mechanical advantage of a pair of scissors might be

Accepted Answer

A)  0.
B)  1/2.
C)  2.
D)  -2.E) B) and D)
F) A) and B)

Question 5

In the formula E0 = mc2, the symbol c represents the speed of

Accepted Answer

A)  an object of mass m.
B)  the observer.
C)  sound.
D)  light.E) A) and D)
F) C) and D) D

Question 6

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long.The force needed to push the safe up is

Accepted Answer

A)  441 N.
B)  450 N.
C)  500 N.
D)  1470 N.E) B) and C)
F) A) and D) A

Question 7

Which of the following is (are)  not a unit of power?

Accepted Answer

A)  Joule-second.
B)  Watt.
C)  Newton-meter/second.
D)  Horsepower.E) A) and B)
F) All of the above

Question 8

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

Accepted Answer

A)  10.2 cm.
B)  1 m.
C)  9.8 m.
D)  98 m.E) B) and C)
F) B) and D) B

Question 9

A bowling ball rolling on level ground at the speed v strikes a basketball at rest.The basketball moves off in the original direction of the bowling ball

Accepted Answer

A)  with the speed v while the bowling ball stops.
B)  faster than v while the bowling ball continues slower than v.
C)  with the speed v while the bowling ball moves backward.
D)  together with the bowling ball at the same speed of less than v.E) B) and C)
F) A) and D)

Question 10

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

Accepted Answer

A)  8 km/h.
B)  40 km/h.
C)  56 km/h.
D)  60 km/h.E) C) and D)
F) None of the above

Question 11

The speed of a 1000-kg car whose KE is 450 kJ is

Accepted Answer

A)  21 m/s.
B)  30 m/s.
C)  45 m/s.
D)  900 m/s.E) A) and C)
F) A) and D)

Question 12

When the speed of an object is doubled,

Accepted Answer

A)  its kinetic energy is doubled.
B)  its potential energy is doubled.
C)  its rest energy is doubled.
D)  its momentum is doubled.E) B) and C)
F) A) and D)

Question 13

A 2-kg book is held 1 m above the floor for 50 s.The work done is

Accepted Answer

A)  0.
B)  10.2 J.
C)  100 J.
D)  980 J.E) B) and D)
F) None of the above

Question 14

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

Accepted Answer

A)  0.2 mm/s.
B)  2 mm/s.
C)  2 cm/s.
D)  20 cm/s.E) A) and D)
F) None of the above

Question 15

Six kJ of work is used to lift an object to a height of 100 m.The object's approximate mass is

Accepted Answer

A)  600 g.
B)  6 kg.
C)  60 kg.
D)  600 kg.E) A) and D)
F) A) and C)

Question 16

According to the general theory of relativity, gravitation

Accepted Answer

A)  acts only on moving bodies.
B)  is really a general acceleration of the universe.
C)  is a distortion in space-time.
D)  is the same as in Newton's theory but is to be interpreted differently.E) A) and B)
F) C) and D)

Question 17

A 1-kg mass has a KE of 1 J when its speed is

Accepted Answer

A)  0.45 m/s.
B)  1 m/s.
C)  1.4 m/s.
D)  4.4 m/s.E) All of the above
F) A) and D)

Question 18

A moving object does not necessarily have

Accepted Answer

A)  velocity.
B)  momentum.
C)  kinetic energy.
D)  potential energy.E) C) and D)
F) None of the above

Question 19

A golf ball and a ping-pong ball are dropped in a vacuum chamber.When they have fallen halfway down, they have the same

Accepted Answer

A)  speed.
B)  potential energy.
C)  kinetic energy.
D)  rest energy.E) B) and D)
F) B) and C)

Question 20

If a shell fired from a cannon explodes in midair,

Accepted Answer

A)  its total momentum increases.
B)  its total momentum decreases.
C)  its total KE increases.
D)  its total KE decreases.E) A) and B)
F) B) and D)

Exam 3: Energy

Which one or more of the following is a vector quantity?

Correct AnswerverifiedShow Answer

When the speed v of an object of mass m approaches the speed of light c, its kinetic energy

Correct AnswerverifiedShow Answer

A ball whose momentum is mv strikes a wall and bounces off.The change in the ball's momentum is

Correct AnswerverifiedShow Answer

The mechanical advantage of a pair of scissors might be

Correct AnswerverifiedShow Answer

In the formula E0 = mc2, the symbol c represents the speed of

Correct AnswerverifiedD

A 150-kg safe on frictionless casters is being raised 1.20 m to the bed of a truck using planks 4.00 m long.The force needed to push the safe up is

Correct AnswerverifiedA

Which of the following is (are) not a unit of power?

Correct AnswerverifiedShow Answer

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

Correct AnswerverifiedB

A bowling ball rolling on level ground at the speed v strikes a basketball at rest.The basketball moves off in the original direction of the bowling ball

Correct AnswerverifiedShow Answer

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

Correct AnswerverifiedShow Answer

The speed of a 1000-kg car whose KE is 450 kJ is

Correct AnswerverifiedShow Answer

When the speed of an object is doubled,

Correct AnswerverifiedShow Answer

A 2-kg book is held 1 m above the floor for 50 s.The work done is

Correct AnswerverifiedShow Answer

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

Correct AnswerverifiedShow Answer

Six kJ of work is used to lift an object to a height of 100 m.The object's approximate mass is

Correct AnswerverifiedShow Answer

According to the general theory of relativity, gravitation

Correct AnswerverifiedShow Answer

A 1-kg mass has a KE of 1 J when its speed is

Correct AnswerverifiedShow Answer

A moving object does not necessarily have

Correct AnswerverifiedShow Answer

A golf ball and a ping-pong ball are dropped in a vacuum chamber.When they have fallen halfway down, they have the same

Correct AnswerverifiedShow Answer

If a shell fired from a cannon explodes in midair,

Correct AnswerverifiedShow Answer

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In the formula E₀ = mc², the symbol c represents the speed of

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D

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B

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